Maximized MDI Window Title Bar Behaviour

I'm writing an MDI Window and trying to get it's behaviour similar to what I thought was the default. I have attached two images as an example.

The images on the left are examples of what I'm trying to achieve when the Client Window maximizes. I just put that together using the defaults in VB6. The windows on the right is where I'm currently at in C++. This is being done purely with the API.

My code is using similar settings that I found in the WinProg MDI tutorial: http://www.winprog.org/tutorial/app_four.html
It has the same behaviour as mine.

Any help on which styles or what I should be doing.

Thanks!